Abstract
ABSTRACT A dual-phase steel was produced from a hot-rolled HSLA steel ASTM-A58S by quenching from an intercritical temperature which produced a structure consisting of 80 vol.% martensite plus 20vol.%ferrite. The as-received hot-rolled structure consisted primarily of 60 vol.% ferrite plus 40 vol.% pearlite. The machinability experiments involved the determination of tool wear, cutting forces, surface finish and chip disposability. Face milling operations were used together with high speed steel tools. The two materials showed large variation in surface finish. The dual-phase steel exhibited the best surface finish over the whole feed range investigated. In terms of cutting resistance, slightly higher forces were shown by the dual-phase steel. The hot-rolled steel exhibited smaller tool wear under all conditions. The results illustrated the superiority of dual-phase steel in terms of disposability of chips. The high machinability of dual-phase steel is the direct result of the presence of hard martensite ...
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